Operation Manual

Specifications for modules 68
6 Specifications for modules
6.1 ADAR
The ADAR is an envelope generator. It uses a gate signal for input and
generates an output envelope signal. The ADAR module can generate two types
of envelopes attack/decay or attack/release. The envelope type is set using the
ad/ar selector. The behavior of the module is shown in Figure 1. In attack/decay
mode the envelope signal rises from 0 Volt to 1 Volt when the gate is triggered
and then immediately decreases form 1 Volt to 0. The time the output signal
takes to go from 0 to 1 Volt is called the attack time, it is set with the attack
knob and the time the signal takes to go from 1 to 0 Volt is the decay time and
is adjusted using the decay knob. In attack/release mode the shape of the output
signal is different since a sustain state is added. The output signal is held to 1
Volt until the gate signal falls to 0 and the release is then triggered. Finally, the lin/exp switch is
used to determine the shape of the different segments of the envelope which can be either linear of
exponential. Note that in Figure 26 the segments are exponential.
attack
time
decay
time
release
time
gate signal
key pressed key released
AR mode
AD mode
time
Figure 26: ADAR response curve
Typical Use
The ADAR is Typically used for generating amplitude envelopes through a VCA, or spectral en-
velopes by modulating the frequency of a filter module.
Note: See also the ADSR, VADSR and VADAR modules.